Suction-pump.



No. 7|l,350. Patented Oct. I4, |902.

D. SCHUURMAN. sucrlon PUMP.

[Application med Jan. 2,34, 1902.;

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No. 7|l,350. Patented Oct. l4, l902.

D. SCHUURMAN.

SUC-TIDN PUMP.

(Application tiled Jam. 24, 1902.)

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UNrrnD Y STATES PATENT 'O1-ruesy DIRK SCHUURMA-N, OF HOBOKEN, NEWJERSEY.

SUCTION-PUNI P.

SPECIFICATION forming part 0f Letters Patent No. 711,350, dated October14, 1902. Application tiled January 24, 1902. Serial No 91,036. (Nomodel.)

1'0 zr/ZZ whom t may concern,.-

Be it known that 1, DIRK SCHUURMAN, of Hoboken, in the county of Hudsonand State of New Jersey, have invented a new and useful Improvement inSuction-Pumps; and I do hereby declare the following, when taken inconnection with the accompanying drawings, and the numerals of referencemarked thereon, to be a full, clear, and exact description or" the same, and which said drawings constitute part of this specitication, andrepresent, in

Figure 1, a side view of a suction-pump having a cylindrical casingconstructed in accordance with my invention; Fig. 2, a top or plan Viewthereof; Fig. 3, a vertical central sectional View ot such a pump; Fig.4, a sectional view of the lower piston; Fig. 5, a top or plan View ofthe same; Fig. 6, a vertical sectional view of thepump embodying myinvention having a rectangular casing; Fig. 7, a top or plan View of thesame.

This invention relates to an improvement in suction-pumps, and whileparticularly intended for ship-pumps is equally applicable tosuction-pumps for other purposes, the oloject of the invention being toarrange two pistons within one cylinder, so that the action will bealmost continuous-that is, the pump will act at both strokes; and theinvention consists in the construction and arrangement ot' parts, aswill be hereinafter described, and particularly recited in the claim.

Preferably the casing 2 will be cylindrical and provided at its lowerends with a fiange 3, by which it may be secured to the deck of a vesselor Wherever it may be used. Within the cylinder are two pistons, thelower one, 4, having a centrally-arranged piston-rod 5, which extends upthrough the piston 6, While the piston 6 is provided with twopiston-rods 7 7, arranged on opposite sides of its center. All the rodshave heads 8 with slots 9 therein. The rod 5 is connected by a lever 10,which is keyed or otherwise secured to a rock-shaft 11, mounted inbrackets 12 at one side of the cylinder. Also secured to this rock-shaft11 is an upwardly-extending handle 13. The two rods 7 7 are connectedwith a yoke 14, which is keyed or otherwise secured to a rock-shaft 15,mounted in brackets 16 at the opposite side of the cylinder, and alsosecured to this shaft and extending upward therefrom is a handle 17, theupper ends of the two handles 13 17 being connected by a rod 18. Therock-shafts 11 and 15 project beyond the cylinder at one side, as shownin Fig. 2, and to their outer ends are secured foot-levers 19 20, theends of which extend past each other and are provided with footholds 2122.

" The pistons 4 and 6 are of usual construction-that is, they include apacking ring or washer 23, of leather or rubber, and valves 24, whichopen as the pistons descend, but close as they are raised.

Instead of forming the cylinder or casing round it may be rectangular,as shown in Figs. 6 and 7, and instead of having the pistons move in avertical line they may be hungat opposite sides. Thus the lower piston25 will be pivotally connected at one side of the casing near the lowerend thereof, while the upper piston 26 will be pivoted on the oppositeside of the casing -near the upper end, the piston-rod 27 of the piston25 extending up through the bearing 28 of the piston 26, while thepiston 26 will be provided with two piston-rods 29, arranged on oppositesides of its center, as clearly shown in Fig. 7. The piston-rod 27 isconnected to the outer end of the lever 30, which extends to theopposite side ofthe casing, where it is mounted on a rock-shaft 31,while the pistonrods 29 are connected with two levers 32,' which extendinto engagement with the rockshaft 33 at the opposite side of thecasing. Connected with these levers are handles 34 34, which extendupward and are connected at their opposite ends by a rod 35. The pistous25 26 are provided with valves 36,which open as the pistons descend andclose as they are raised. Like the construction before described, therock-shafts 31 33 may extend beyond the side of the casing and beprovided with foot-levers 37 for footholds 38, or footholds 39 may bearranged upon the levers 30 32. The cylinders will also be provided withthe usual discharge-mouths 40. The pistonrods 5 and 27 will also extendthrough stufting-boxes 41 of usual construction.

The operation will be the same whatever the shape of the casing orcylinder may be- IOO that is, the movement of the levers willalternately raise and lower the pistons. As the lower piston rises itwill draw the water into the cylinder, and as it rises the water whichis between the pistons will be discharged through the valves in theupper piston, the upper piston descending at the same time the lowerpiston rises. As the lower piston descends its valves will open, and atthe same time the upper piston rises and draws water through the lowerpiston and discharges the water which rests on its upper surface. Thusat both movements of the levers a suction and discharge takes place. Thefootlevers are arranged so that one man standing on the levers andgrasping the upwardly-extending handles can exert his entire Weight onboth pistons alternately, thus practically obtaining the same result aswould two men, and substantially the same result is accomplished withone pump as would ordinarily be accomplished by two.

I am aware that double-acting pumps comprising a single cylinder withtwo pistons arranged therein adapted to operate reversely are old, andtherefore do not wish to be understood as claiming, broadly, such as myinvention. n

Having fully described my invention,what I claim as new, and desire tosecure by Letters Patent, is-

In a suction-pump, the combination with the casing thereof, of twopistons arranged therein, one above the other, piston-rods secured tosaid pistons and extending upwardly therefrom, rock-shafts arranged atopposite sides of said casing,levers connecting said piston-rods withsaid rock-shafts, foot-levers secured to the ends of said rock-shafts,the ends of 'said levers extending past each other, substantially asdescribed.

In testimony whereof I have signed this specification in the presence oftwo subscribing witnesses.

DIRK SOI-IUURMAN. Witnesses:

MAX BOROHARDT, WILLEM KLOMP.

